https://bugs.kde.org/show_bug.cgi?id=390272

            Bug ID: 390272
           Summary: Wrong rendering of QComboBox in itemviews
           Product: Oxygen
           Version: unspecified
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: style
          Assignee: hugo.pereira.da.co...@gmail.com
          Reporter: ch.ehrlic...@gmx.de
  Target Milestone: ---

Created attachment 110537
  --> https://bugs.kde.org/attachment.cgi?id=110537&action=edit
Testcase

When a QComboBox is drawn in an itemview, the background is not cleared which
results in unreadable text when the background text does not match the text in
the combobox (see attachment).
This happens with oxygen and with fusion style. The reason is, that the
background is not cleared in Style::drawComboBoxComplexControl(). I'm not sure
if it is a KDE or Qt bug but since all Qt styles work fine (maybe by accident
because most of them draw the complete combobox rect every time) I decided to
create a bug here.
Also setting "widget->setAttribute(Qt::WA_OpaquePaintEvent, false);" in
polish() doesn't help (although Qt's fusion style is doing this)...

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